I am injecting a partial into a page using $().html(content). Part of the partial is JavaScript code in an inline script block I need to inspect. When I look in the Sources tab in the Chrome Developer Tools it doesn't show the injected content. All it shows is the original source.
Is there a way to gain access to the JavaScript?
Update
I am using Google Chrome 21.0.1180.77 but I also have Google Chrome Canary installed.
I don't have a Sources tab (Elements, Resources, Network, Scripts, Timeline, Profiles, Audits, Console).
The Elements tab always reflects the current state of the DOM, so it will show any injected scripts. EDIT: This appears to be wrong.
There's a Chrome issue about this: http://code.google.com/p/chromium/issues/detail?id=95352
You can add a specially formed comment to the injected JavaScript code, and it will then show up in the Scripts tab (but it still doesn't show up in the Elements tab, for whatever reason):
//# sourceUrl=whatever.js
How to see injected snippets:
In order for injected code to be visible, you will need to add a sourceURL comment to the top of the evaluated script, like one of the following:
//# sourceURL=//domain/file.js
//# sourceURL=http://domain/file.js
//# sourceURL=https://domain/file.js
//# sourceURL=//domain/file
Note, that without the // hinting at the protocol and some domain immediately following, then the injected snippet will not show up under sources by default.
How to see injected snippets without a protocol and domain:
Continuing, with just a file name, like so:
//# sourceURL=file.js
You will have to change the source settings by unchecking Group by folder. See image.
Related
I am using WebIde of SAPUI5 development.
If I write a console.log or alert it shows error of unexpected Alert and so on inside of the editor.
While the code works and I prefer to not see these errors inside of the editor.
How can I customize WebIde to not show these kind of errors.
While it is discouraged to use console.log and alert statements in your code because
[...] such messages are considered to be for debugging purposes and therefore not suitable to ship to the client [...]
http://eslint.org/docs/rules/no-console
and
[...] JavaScripts’ alert, confirm, and prompt functions are widely considered to be obtrusive as UI elements and should be replaced by a more appropriate custom UI implementation [...]
http://eslint.org/docs/rules/no-alert
you can have your Linter configured to bypass these checks (although I would not recommend to do so)
But keep in mind these checks are not specific to SAPUI5 or Web IDE, rather for every Javascript project!
Anyway, since Web IDE uses ESLint, to disable the check, add the following on top of the affected Javascript file:
/*eslint-disable no-console, no-alert */
GWT is used and the application is deployed on WebLogic using HTTPS.
The performance is poor and with F12 Developer Tools, we could see that blank.html is downloaded multiple times. This is clearly related to GWT but we have not been able to figure out why.
The following is from javascript:
defineSeed(2613, 2614, makeCastMap([Q$BaseModelData, Q$ModelData, Q$Theme, Q$Serializable]), Slate_0);
var SLATE;
function $clinit_GXT(){
$clinit_GXT = nullMethod;
IMAGES = new XImages_generatedBundle_0;
MESSAGES = new XMessages__0;
SSL_SECURE_URL = getModuleBaseURL() + 'blank.html';
}
This is from GWT.java:
/**
* URL to a blank file used by GXT when in secure mode for iframe src to
* prevent the IE insecure content. Default value is 'blank.html'.
*/
public static String SSL_SECURE_URL = GWT.getModuleBaseURL() + "blank.html";
Does anyone know under what circumstances blank.html is called?
Thanks!
This is from GWT.java:
This is actually from GXT.java.
This is used in a few cases when creating an <iframe> element, so that IE won't give errors if your site is hosted from SSL. I can actually only find one case (as of GXT 3.1.1) which uses this, in Layer.java. Only IE pages loaded from https urls will make use of this.
The Layer class uses this as a "shim", a way to prop up some DOM elements above overs, and work around some browser bugs (typically plugin or iframe related). Menus and popup dialogs use this to ensure that they don't appear "underneath" content that they should be "above".
This file is very small - just enough HTML to convince IE than the iframe has correctly loaded, and no more. It never changes, and should load nearly instantly.
As far as performance goes, this should only happen when a Menu or Window/Dialog/Tooltip is shown - these shouldn't be happening on app startup usually, at least not more than a window or two. Additionally, the browser should recognize that it is loading the same element and cache it correctly, and not load it multiple times (though it might be listed several times as hitting the cache). If the server has instructed the browser to never cache the file, that is something you should look at changing.
In short, this is very unlikely to be the cause of any performance issues, at least in GXT itself. If somehow you have the shim enabled on every single widget in your project, this should not be required. If the file is loading slowly, something may be very wrong with your server configuration.
For reference, here is the entire file:
<html></html>
For example, I have an ajax request and it returns <script src='buggy.js'></script>.
Problem is, it doesn't show up in sources or resources panel. That means I can't do all the cool stuffs like adding breakpoint and inspecting the elements as they run.
I could only see the source of the js file under the Network panel.
Is there anyway to make chrome add them to the sources panel?
Or how do you guys go about debugging dynamically added scripts?
Using Canary.
I was having the same problem, and I found a workaround that is better than the deliberate exception. It does still require changing the code as opposed to just setting a breakpoint inside the chrome dev tools.
I tried using the "//# sourceURL=dynamicScript.js" that was suggested as a workaround by the OP, but it still wasn't showing up for me unless it already existed in my tabs from a previous time when it produced an exception.
Coding a "debugger;" line forced it to break at that location. Then once it was in my tabs in the Sources panel, I could set breakpoints like normal and remove the "debugger;" line.
Please refer to https://developer.chrome.com/devtools/docs/javascript-debugging#breakpoints-dynamic-javascript
(Original link is broken-- archived link below)
http://web.archive.org/web/20141016164821/https://developer.chrome.com/devtools/docs/javascript-debugging#breakpoints-dynamic-javascript ("Breakpoints in Dynamic JavaScript").
When I dynamically load a snippet of html containing javascript via AJAX, I cannot see that content in the source tab in the developer tools window in Chrome 22.0.1229.94. Tellingly, I went here
https://developers.google.com/chrome-developer-tools/docs/scripts-breakpoints#js_dynamic
This page shows an example developer tools window which is out of date. There is a button on the page to load a dynamic script and it does not show up in the source tab when you do.
As a work-around, I have found that adding
debugger;
to the script and reloading it will cause it to pause in the dynamically loaded code, but unfortunately, all the line numbers are greyed out and you can't set any breakpoints within the debugger.
Am I missing something here or what?
Thanks,
Rob
When you use a library or javascript code that you have loaded it dynamically, you can use the phrase
//# sourceURL=foo.js
at the beginning of your javascript code that foo.js is the name that will be assigned it. debugger will show it with that name.
This is true in chrome, and I think in firebug too.
In this case you can place a breakpoint in the dynamically loaded javascript code.
Possible duplicate of:
Is possible to debug dynamic loading JavaScript by some debugger like WebKit, FireBug or IE8 Developer Tool?
Don't know if this works or not in chrome (This definitely doesn't work for me now, may be in the past).
//# sourceURL=foo.js
Working Solution
For your dynamically loaded script via ajax to appear in your chrome source tool, you need to add the following line at the start or end (I prefer) location of your script file:
//# sourceURL=foo.js
And your script with name foo.js will appear at the left pane of source tab under (no domain) dropdown
->localhost
-- source/src
->(no domain)
-- foo.js
Alternatively you can add the below line in your script anywhere between the scripts.
debugger;
In chrome, you can use " debugger; " statement to break at a statement when debugger panel is open. Chrome will simply ignore this if the debugger panel is closed.
This will help stop your script in debugging mode and you will see your script in source (debugging) panel with name like VM****.
Hope this helps.
You can use //# sourceURL. Chrome doesn't seem to be supporting //# sourceURL for inline scripts. However, it does work on eval expressions. This article gives more details about naming eval blocks and naming of any anonymous functions in your code.
Instead of using eval, you can try embedding a script tag or JSONP may be.
Varunkumar Nagarajan
for me it happened on nodejs project.
i restarted server and open in new tab my app and tada!..
Alternatively, to fix this problem you can open developer tool in a seprate window by clicking the icon. Now reload your script, and it will shown in script tab as expected. I know this is not a solution but a work arround.
recently I had to remove my entire cache to be able to view a webpage I was working on. This is fine I guess but it could be improved by removing specific pages from the cache.
the chrome.browsingData.remove, seemingly has no option for indicating individual pages for removal. I was wondering if this could be done externally, but I am not familiar with the chromium code. I was also wondering if there are any planned changes to the chrome.browsingData.remove implementation.
Many thanks
To remove a single file cache enter its URL into browser and do hard refresh.
If you are working on a webpage and wish to avoid caching (btw, it's recommended! :) You can do it today in Chrome DevTools.
Go to Settings (the icon in the bottom-right corner) and click on it.
Then, you will have an option 'disable cache' - mark it and you done.
Just don't forget to return this state when you done working as chrome will be faster with its caching schema.
Edit 10/Feb/2022: Access the remote dev tools documentation for a whole suit of tools available to override cached files while developing:
https://developer.chrome.com/docs/devtools/storage/cache/
If you are attempting to clear HTTP cached data, which was the original question in the post, then the network log is where it is possible. the guide for that is here:
https://developer.chrome.com/docs/devtools/network/#load
First find the file then release its cacged content by right clicking:
https://developer.chrome.com/docs/devtools/network/reference/#clear-cache
To remove all files (not single files) while in Chrome DevTools you should click on the Dev Tools settings then choose
"Disable cache (while DevTools is open)". This was the first option on the page - it is now (as of Chrome 103 in 2022) under network in Preferences.
Note that these settings are not the main Chrome settings, but are specific to Dev Tools.
You can reach DevTools by pressing F12 while on a web page you want to debug or by pressing Ctrl-Shift-I.
Edited 28 July 2022
If you're building the page dynamically, then during development, you can put a random string at the end of the URL used to load the script.
<script src="path/to/script.js?_=<%=Math.random()%>"></script>
This will cause a cache miss for that file but will use the cache for everything else (subject to cache-control headers and so on). Just remember to remove the parameter before pushing to prod!
UPDATE : 2019, April 20
Lately, I'm working with Chrome browser's inbuilt feature - Overrides. With this feature, we can write code for HTML, CSS, JS, etc directly in the console and see it on the web-page.
Here's a tutorial that might be helpful
Previous Answer :
I'm working with Google Chrome extension Resource Override.
After installing this extension, I'm overriding the resource which I want from the server instead of cache:
STEP #2 : Override the resource which you want fresh from the server:
⭐Important Note - Access the plugin from the developer-console instead of the browser
⭐⭐ I started with this approach but have moved to approach suggested by Lukas Greblikas in the answer above.
Good Luck...